When I need to take a leak if I am in public I always use a urinal in the Men's Room. If I am at home and need to take a leak, I walk up to the toilet, lift the seat, and stand there and urinate. In general, I prefer to stand!
I have peed while showering in the Men's locker room of my gym. It just feels good to release a full bladder as you shower! It is a communal shower, and I have also seen other men my age and older peeing as they shower. I am never purposefully looking, but the shower holds lots of men and we are all just standing there naked so it is unavoidable to look at each other, so I have definitely caught glimpses of yellow urine streams leaving guy's penises.